Water powered dishwasher

ABSTRACT

An improved water powered dishwasher is provided that is particularly useful in areas of low water pressure. A water inlet extends into the dishwasher to discharge water through a first aperture which directs water substantially upwardly, perpendicular to the bottom of the dishwasher, and through a second aperture which directs water laterally outwardly. The second aperture is of lesser cross-sectional area than the first aperture. A rotatable spray unit having a supporting housing which preferably is made of polyethylene is supported for rotation about the water inlet, and includes perpendicularly and laterally disposed tubes in communication with the apertures of the water inlet.

United States Patent Ross Dec. 16, 1975 [54] WATER POWERED DISHWASHER [76] Inventor: Jack Ross, 230 Richmond 81. East, Bleutge Toronto 2, Ontario, Canada [22] Filed: May 2, 1974 57 ABSTRACT 21 A l. N .1 466,19 l 1 PP O 8 An improved water powered dishwasher is provided that is particularly useful in areas of low water pres- [52] US. Cl. 134/179; 134/100 sure, A water inlet extends into the dishwasher to dis- [51] Int. Cl. B08B 3/02 charge water through a first aperture which direc s Fleld of Search water substantially upwardly, perpendicular to the 179 bottom of the dishwasher, and through a second aperture which directs water laterally outwardly. The secl References Cited ond aperture is of lesser cross-sectional area than the UNITED STATES PATENTS first aperture. A rotatable spray unit having a support- 2,320,133 5/1943 Horwitz 134/179 ing housing which Preferably is made of Polyethylene 3,385,306 5/1968 Brater et a1 134/179 x is Supported for rotation about the Water inlet, and 3,469,586 9/1969 Berson et al 134 179 x eludes p rp ndicularly and laterally disposed tubes in 3,773,060 11/1973 Byrd 134/179 communication with the apertures of the water inlet.

FOREIGN PATENTS OR APPLICATIONS 10 Claims, 6 Drawing Figures 380,316 9/1964 Switzerland 134/176 US. Patent Dec. 16, 1975 Sheet 1 of 3 3,926,668

U.S. Patent Dec. 16, 1975 Sheet20f3 3,926,668

FIG.

WATER POWERED DISHWASHER FIELD OF INVENTION This invention relates to improvements in water powered dishwashers.

BACKGROUND TO THE INVENTION Although water powered dishwashers have been known in the art for some time, those provided have not been highly satisfactory. A typical unit comprised an outer container shell, a closure top adapted to seat on the container shell and enclose a washing cavity therewith, water inlet means, a hose permanently attached to one end of the water inlet means and adapted to be temporarily secured to the end of a faucet at its other end so as to direct water therefrom through the hose and inlet means into the cavity. The water was subsequently fed into a rotatable spray unit which comprised a housing adapted to receive the water discharged by the inlet means and to direct it to vertical and horizontal tubular stems having apertures therein in spaced relation through which the water was released to rotate the spray unit and wash the cutlery and dishes arranged within the cavity. A soap well was provided on the inlet means for introducing a measured amount of soap solution by gravity feed into the water passing through the inlet means prior to the water being sprayed onto the dishes. Drainage holes in the bottom near one end of the shell container were provided to drain the runoff water and to vent the unit to the atmo sphere. As a result, dishes arranged in the cavity were first sprayed with a soap and water solution for washing, then water for rinsing and finally dried by offsetting the top relative to the shell to create an upward convection current from within the cavity to the atmosphere.

This typical unit was, however, plagued with numerous problems which affected its overall efficiency, performance and operation. The rotatable spray unit would consistently wobble, thus decreasing the cleaning efficiency of the unit. Attempts were made in such prior art constructions to overcome this problem, however, without being wholly successful. See, for example, US. Pat. No. 3,469,586'wherein a member extending downwardly from the top was provided to contact a bearing surface at the upper end of the vertical hollow tubular member of the rotatable spray unit to secure the stem substantially upright at all times. This arrangement, however, was not practical inasmuch as it was difficult to secure such downwardly extending member on the bearing surface of the vertical hollow tubular member. Furthermore, due to the fact that the temperature of the water used for washing the dishes often exceeded 170F the closure top would soften and tend to sag and rub against the vertical and horizontal tubular spray stems of the rotatable spray unit as the unit rotated, thus further impeding the dishwashers opera tion.

In addition, because of the complexities in the structures of the prior art securing the rotatable spray unit for rotation, most units tended to be inefficient and would cease operating altogether through prolonged use. Even where a simple construction was provided, such arrangement was plagued with difficulties. For example, where a threaded screw was provided securing the rotatable spray unit, and in particular the housing, to the inlet means by having the screw extend through the spray unit into a peripheral circular channel recess in the outer wall of the inlet means, permitting rotation of the spray unit thereabout, the unit, after a period of use, would become inoperable for all intents and purposes, as a result of the upward pressure of the water forcing the rotatable spray unit upwardly, which also vertically lifted the threaded screw. As a result, the screw tended to rub the surface of the downward facing ledge at the upper extent of the channel recess and created burrs on that surface of the ledge which impeded the rotation of the spray unit or caused the spray unit to seize and cease to operate altogether.

Furthermore, the disposition of the cutlery and dishes in the prior art dishwashers and the disposition of the apertures in the vertical and horizontal spray tubular stems in the spray unit did not provide for a very efficient cleaning operation. In particular, the disposition of the apertures was such that water was not sprayed on all dishes arranged in the cavity to be washed and the arrangement of the dishes and cutlery was such as to preclude an effective washing operation. As a result of the foregoing, the typical prior art unit had a short life expectancy and operated effectively only for a short time and only when the pressure of the water provided exceeded 40 p.s.i. In general, prior art devices were useless in areas having low water pressure, e.g. l5 p.s.i.

BRIEF SUMMARY OF THE INVENTION According to an important aspect of the invention, an improved water powered dishwasher is provided which will operate effectively in areas of low water pressure.

According to another important aspect of the invention, an improved water powered dishwasher is provided having an improved rotary spray system adapted for rotation in the cavity in a novel manner, remaining substantially upright at all times during rotation relative to the bottom of the container shell.

According to a still further important aspect of the invention, the spray of water from the spray unit covers all dishes and cutlery whereby they are effectively washed and cleaned.

According to a still further important aspect of the invention, a novel closure top may be provided whereby the deficiencies of the prior art are overcome.

According to another still important aspect of the invention, a dishwasher is provided having an uncluttered appearance when not in use.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a dishwasher according to a preferred embodiment of the invention.

FIG. 2 is partly exploded perspective view of a dishwasher according to a preferred embodiment of this invention.

FIG. 3 is a perspective view, partially in section, of the container shell of a dishwasher according to a preferred embodiment of the invention.

FIG. 4 is a partial cross-section looking generally in the direction of line 4-4 taken in FIG. 3.

FIGS. 5 and 6 illustrate a detachable hose connection being attached to the dishwasher and are shown with FIG. 1.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1, 2 and 3, a water powered dishwasher 10 is shown, which generally comprises container shell 12, having bottom 14, side walls 16, ledge 18, extending outwardly from side walls 16 at the upper end thereof and peripheral walls 20 extending upwards from the outer edge of ledge 18; top 22; detachable hose 24, detachable from both the dishwasher and and faucet 26 at 28 and 30 respectively; a water conduit 32 for introducing water from the hose 24 into the cavity 34 created between the container shell 12 and the top 22 when the top is placed on the ledge 18 of container shell 12; rotatable spray unit 36, for spraying water onto the dishes; dish rack 38; cutlery rack 40; soap well 42 and drainage apertures, one of which is shown at 44.

A water conduit generally denoted as 32 seen best in FIG. 3, is provided for introducing water from the hose 24 into the cavity 34, comprising mouth portion 46, tube 48 comprising portions 100 and 102 and bearing member 104 having water inlet or passage 108. The conduit 32 has an enlarged mouth portion 46 relative to tube 48. Enlarged mouth portion 46 comprises neck 50 disposed between enlarged ends 52 and 54 and at a predetermined distance from end 52. The neck 50 is defined by obliquely disposed side walls 55 and 56 at either end thereof.

Referring specifically to FIGS. 5 and 6, there is shown connector 58 for detachably attaching hose 24 to portion 46 of conduit 32. Connector 58 generally comprises a tubular extension 60 extending axially into the hose 24 to direct water from the hose through the connector into conduit 32. Wall 62 extends radially outwardly therefrom to hollow cylinder 64 which cylinder extends substantially at right angles thereto and forms part thereof, projecting away from the hose having a radially outwardly extending circular projection 66 disposed near wall 62 having longitudinally forwardly abutting face 68. Radially outwardly of hollow cylinder 64, is hollow cylinder 69 having an inwardly radially extending circular projection 70 with a rearwardly facing abutting face 72, of substantially the same radial extent as projection 66 but more forward of wall 62. Between the two faces 68 and 72, a plurality of compression springs 74 are disposed, adapted to maintain face 72 a fixed distance from face 68 when said springs 74 are in a relaxed or normal state. At the longitudinally forward extent of circular projection 70 is longitudinally rearwardly sloped face 76 adapted to ride against ball bearings 78 disposed in apertures 80 of lesser diameter than the ball bearings 78, a predetermined distance from the mouth 82 of the connector.

When springs 74 are in a relaxed state, projection 70, and in particular downwardly facing face 84 overlies ball bearings 78. Ring 86 is secured forwardly of aperture 80 to maintain cylinder 69 in operating relation to cylinder 64. Gasket 88 is seated between wall 62 and radially inwardly stepped portion 90 of cylinder 64, to ensure a proper seal between connector 58 and mouth portion 46 when mouth portion 46 is secured into the connector such that no leakage of water occurs when passed from the hose to the inlet. The outer periphery of the mouth portion 46 of the conduit 32 corresponds in cross-sectional radial dimensions to the diameter of the mouth 82 of the connector 58.

In operation, cylinder 69 is urged rearwardly compressing springs 72 against face 68. Mouth portion 46 of conduit 32 is inserted into the mouth 82 of the connector 58 forcing the ball bearings 78 radially outwardly until portion 52 passes the bearings. Cylinder 69 is then released and under force exerted by the springs,

4 projection is urged over bearings 78 forcing them into neck 50 between ends 52 and 53 retaining the leading edge 92 of the mouth 46 against gasket 88 to prevent any leakage of water when the water passes between the hose 24 and conduit 32.

Referring specifically to FIG. 3, mouth portion 46 of conduit 32 is disposed outside the container shell 12 and is attached to the hose as hereinbefore described. Also disposed exteriorly of container shell 12 is soap well 42, seen best in cross-section in FIG. 4, comprising top 94 threaded onto annular wall 96 enclosing well 98 connected to conduit 32 by two tube portions 100 and 102, comprising tube 48, threaded into diametrically opposed apertures 104 and 106 respectively. As the water passes from tube portion 100 to tube portion 102, soap is drawn into the water and mixed therewith. Tube 48 comprising portions 100 and 102, extends below the bottom 14 of shell 12 to the centre thereof to a perpendicularly extending bearing member 104 and is secured into aperture 107 of bearing 104. At its lower end bearing member 104 has a chamber 106 into which the water from tube 48 is discharged. Passage 108 rises substantially perpendicular from chamber 106 and runs the remainder of the length of bearing member 104. Passage 108 has outlet aperture 1 10 at its upper end which permits water to be discharged perpendicularly from bearing member 104, and diametrically opposed bleed apertures 112 and 114, below aperture 110, which permit water to be discharged laterally, each of apertures 112 and 114 being of less diameter than aperture 110. For example, apertures 112 and 1 14 may be about three-fourths the cross-sectional area of aperture 110. The lower portion of member 104 is threaded at 112 to receive a threaded nut 115. Radially extending annular flange 114 is disposed a predetermined distance upwards on member 104 rising above flange 114 is of reduced cross-sectional area than threaded portion 112. Gasket 117 is disposed between flange 114 and bottom 14 when the member 104 is inserted through aperture at the centre of bottom 14, to act as a liquid seal. Nut is then threaded and tightened onto portion 112 to contact bottom 14 and urge flange 114 downwards. In this way, member 104 is maintained substantially perpendicular relative to bottom 14 at all times.

Seated on and adapted to rotate about bearing member 104, is rotary spray unit 36 comprising housing 122 preferably of a waxy polymer as for example, polyethylene, and has vertically extending tubular stem 124 of substantially the same internal diameter as aperture 110 extending perpendicular from the top of housing 122, and laterally extending tube 126 coaxial with apertures 112 and 114 when said housing is positioned over member 104 and of substantially the same internal diameter. Securing housing 122 to member 104 is a screw 128 which extends through housing 122 into a channel 130 laterally disposed in member 104 and defined at its upper extent by downwardly facing ledge 132; and, in this case, having apertures 112 and 114 opening therein. Screw 128 is threaded for that portion which passes through housing 122 but is unthreaded for that portion which extends past housing 122 into channel 130. When water is introduced into inlet 32 and escapes through aperture 110, a vertical force is exerted on housing 122 forcing it upwards until unthreaded portion of screw 128 contacts downward facing ledge 132. As the housing 122 rotates about member 104 by the action of the water, hereinafter described, the unthreaded portion of the screw rides against the downward facing ledge 132 which acts as a thrust bearing. Both upwardly extending stem 124 and laterally extending stem 126 have positioned apertures through which water, received by the stems, is sprayed in jets, each jet having at least a lateral force component. Stern 124 extends vertically a predetermined distance and is then bent at right angles becoming portion 126 extending over the cavity 34. A'pertures to discharge water are also disposed therein. Therefore, as a result, water ejected through stem 126 and portion 136, rotates the spraying unit.

The end 138 of portion 135 is angled generally downwardly and. is'closed by a plug (not shown) which may have an aperture therein for discharge of water as shown at 140.

Dish tray 38 is adapted to seat on the bottom of the cavity above the lower stem 126. U-shaped dish supports 142 of varying sizes are provided on the tray such that large plates can be supported near the periphery of the shell and smaller dishes at the center. Cutlery tray 40 is provided as an extension of ledge 18, having aperture 144 through which cutlery may be inserted or such cutlery trays may be substituted by baskets to hold the cutlery.

Top 22 is provided having base peripheral flange 146 to seat on ledge 18 and abut against peripheral walls 20. Near the upper portion of the top is a handle 148 and disposed concentrically thereabout are circular steps 150 and 152 for support.

At the bottom of shell container 12, are channels 154 and 156 seen best in FIG. 3, which lead to drainage apertures such as aperture 44.

In operation the hose is connected to the faucet 26 and conduit 32, the soap well 42 is filled with liquid detergent and the cutlery and dishes appropriately arranged in the cavity 34. When the hot water is turned on, the spray unit rotates discharging first the soap solution over the dishes, then clear water. Afterwards, the water is turned off, and the top 22 is offset relative to container shell 12 so that a convection current rises from the cavity 34, which cavity is vented to atmosphere through, for example, aperture 44 and assists in drying the dishes. Due to the structure of the bearing member 104 and apertures 110, 112 and 114, disposed therein, the cross-section of the stems 124 and 126, the construction of the screw 128 and the housing 122 which is preferably constructed of a polymer, e.g. polyethylene, the dishwasher can be successfully used in areas of low water pressure. Furthermore, nut 115, se curing the bearing 104 to the bottom 14 maintains said member 104 substantially vertically relative to bottom 14, and thus maintains the rotatable spray unit 36 substantially perpendicular relative to bottom 14 at all times, thereby increasing the units efficiency and operation.

The rotary spray unit 36 may comprise aluminum, although the housing 122 preferably comprises a polymeric material as for example, polyethylene or acrylic. The shell container 12 and top 22 also preferably comprise a polymeric material both of which are preferably vacuum formed. The dish tray may be wire formed and coated with a polymeric material, e.g. vinyl.

As many changes could be made in carrying out the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not in a limiting sense.

The embodiments of the invention inwhich an exclusive property or privilege is claimed are defined as follows: I

l. A water-powered dishwasher comprising a container shell, a top adapted to seat on said container shell to define. therewith a washing cavity within said shell and top; water inlet and outlet means, a portion of said water inlet means extending into the washing cavity and being secured by securing means adjacent the bottom of the container shell in substantially perpendicular relation to said bottom at all times to discharge a column of water substantially perpendicular to said bottom proximate the center thereof through a first aperture disposed proximate the upper end of said portion of the water inlet means extending into the washing cavity and a laterally directed stream of water through at least one second aperture of lesser crosssectional area than the water column, disposed in said portion of the water inlet means below said first aperture; rotatable spray means, having a housing at the base thereof of an internal surface configuration to seat over at least a portion of the outer surface of said portion of the water inlet means in substantially perpendicular relation to said bottom, secured for rotation about said portion by retaining means extending through the housing of the rotatable spray means to ride in a channel substantially parallel to the bottom of the container in the outer wall of said portion, the portion of the retaining means which projects into the channel having a smooth surface to contact a downwardly facing ledge defining the upper extent of said channel to act as a thrust bearing thereagainst when the rotatable spray means and therefore the retaining means is moved upwardly by the force of the column of water discharged, the housing of said rotatable spray means having a lower tube disposed substantially parallel to the bottom of said container shell and in communication with said at least one second aperture to receive a flow of water therefrom; said lower tube having apertures disposed in the wall of said tube to effect outflow of jets of water therefrom, each jet having horizontal and vertical force components; said rotatable spray means further comprising a perpendicularly disposed tube relative to said container shell bottom and in communication with said first aperture to receive said column of water and to discharge the water through apertures in the wall of said tube as jets of water, each jet having at least a horizontal force component.

2. The dishwasher as claimed in claim 1 wherein said securing means maintaining said portion of the water inlet means extending into the washing cavity substantially perpendicular to said bottom comprises an integral laterally extending flange disposed on the portion of said inlet means that extends into said cavity adjacent the bottom of said container shell so as to seat proximate the upper surface of the bottom of said container shell; and by fastening means disposed below the bottom of said container shell :50 as to urge said flange downwardly towards said bottom.

3. The dishwasher of claim 2 wherein said water inlet means extends below the bottom of the container shell prior to extending into the washing cavity and said fastening means comprises a threaded nut secured to the water inlet means below the bottom of the container shell to contact the undersurface thereof and urge said flange downwardly towards said bottom.

4. The dishwasher of claim 1 wherein said housing comprises a polymeric material.

5. The dishwasher as claimed in claim 4 wherein said housing comprises polyethylene.

6. A dishwasher as claimed in claim 1 wherein said top is reinforced by concentrically disposed circular steps disposed at substantially the centre of said top.

7. A dishwasher as claimed in claim 1 wherein said top sits on a ledge formed in said container shell; and further comprising cutlery holding means having a plurality of apertures formed in an inwardly disposed extension of said ledge.

8. A dishwasher as claimed in claim 1 wherein said perpendicularly disposed tube further includes an extension thereof disposed at substantially right angles thereto, proximate said top when said top is closed onto said container shell; said extension having apertures therein to discharge water and having the end thereof which is remote from said perpendicularly disposed tube being further bent and directed generally towards said container shell bottom; said extension being closed at said remote end and having an aperture in said end in a plane substantially perpendicular to the plane of disposition of the apertures disposed in said extension.

9. The dishwasher as claimed in claim 1 wherein the ratio of the cross-sectional area of said at least one second aperture to the cross-sectional area of said first aperture is about 3:4.

10. The dishwasher as claimed in claim 1 wherein the ratio of the cross-sectional area of said at least one second aperture to the cross-sectional area of said first aperture is less than 3:4. 

1. A WATER-POWERED DISHWASHER COMPRISING A CONTAINER SHELL, A TOP ADAPTED T SEAT ON SAID CONTAINER SHELL TO DEFINE THEREWITH A WASHING CAVITY WITHIN SAID SHELL AND TOP; WATER INLET AND OUTLET MEANS, A PORTION OF SAID WATER INLET MEANS EXTENDING INTO THE WASHING CAVITY AND BEING SECURED BY SECURING MEANS ADJACENT THE BOTTOM OF THE CONTAINER SHELL IN SUBSTANTIALLY PERPENDICULAR RELATION TO SAID BOTTOM AT ALL TIMES TO DISCHARGE A COLUMN OF WATER SUBSTANTIALLY PERPENDICULAR TO SAID BOTTOM PROXIMATE THE THEREOF THROUGH A FIRST APERTURE DISPOSED PROXIMATE THE UPPER END OF SAID PORTION OF THE WATER INLET MEANS EXTEDING INTO THE WASHING CAVITY AND A LATERALLY DIRECTED STREAM OF WATER THROUGH AT LEAST ONE SECOND APERTURE OF LESSER CROSS-SECTIONAL AREA THAN THE WATER COLUMN, DISPOSED IN SAID PORTION OF THE WATER INLET MEANS BELOW SAID FIRST APERTURE; ROTATABLE SPRAY MEANS, HAVING A HOUSING AT THE BASE THEREOF OF AN INTERNAL SURFACE CONFIGURATION TO SEAT OVER AT LEAST A PORTION OF THE OUTER SURFACE OF SAID PORTION OF THE WATER INLET MEANS IN SUBSTANTIALLY PERPENDICULAR RELATION TO SAID BOTTOM, SECURED FOR ROTATION ABOUT SAID PORTION BY RETAINING MEANS EXTENDING THROUGH THE HOUSING OF THE ROTATABLE SPRAY MEANS TO RIDE IN A CHANNEL SUBSTANTIALLY PARALLEL TO THE BOTTOM OF THE CONTAINER IN THE OUTER WALL OF SAID PORTION, THE PORTION OF TTHE RETAINING MEANS WHICH PROJECTS INTO THE CHANNEL HAVING A SMOOTH SURFACE TO CONTACT A DOWNWARDLY FACING LEDGE DEFINING THE UPPER EXTENT OF SAID CHANNEL TO ACT AS A THRUST BEARING THEREAGAINST WHEN THE ROTATABLE SPRAY MEANS AND THEREFORE THE RETAINING MEANS IS MOVED UPWARDLY BY THE FORCE OF THE COLUMN OF WATER DISCHARGED, THE HOUSING OF SAID ROTATABLE SPRAY MEANS HAVING A LOWER TUBE DISPOSED SUBSTANTIALLY PARALLEL TO THE BOTTOM OF SAID CONTAINER SHELL AND IN COMMUNICATION WITH SAID AT LEAST ONE SECOND APERTURE TO RECEIVE A FLOW OF WATER THEREFORM; SAID LOWER TUBE HAVING APERTURES DISPOSED IN THE WALL OF SAID TUBE TO EFFECT OUTFLOW OF JETS OF WATER THERE FROM, EACH JET HAVING HORIZONTAL AND VERTICAL FORCE COMPONENTS; SAID ROTATABLE SPRAY MEANS FURTHER COMPRISING A PERPENDICULARLY DISPOSED TUBE RELATIVE TO SAID CONTAINER SHELL BOTTOM AND IN COMMUNICATION WITH SAID FIRST APERTURE TO RECEIVE SAID COLUMN OF WATER ANDT DISCHARGE THE WATER, EACH JET HAVING AT LEAS IN THE WALL OF SAID TUBE AS JETS OF WATER, EACH JET HAVING AT LEAST A HORIZONTAL FORCE COMPONENT.
 2. The dishwasher as claimed in claim 1 wherein said securing means maintaining said portion of the water inlet means extending into the washing cavity substantially perpendicular to said bottom comprises an integral laterally extending flange disposed on the portion of said inlet means that extends into said cavity adjacent the bottom of said container shell so as to seat proximate the upper surface of the bottom of said container shell; and by fastening means disposed below the bottom of said container shell so as to urge said flange downwardly towards said bottom.
 3. The dishwasher of claim 2 wherein said water inlet means extends below the bottom of the container shell prior to extending into the washing cavity and said fastening means comprises a threaded nut secured to the water inlet means below the bottom of the container shell to contact the undersurface thereof and urge said flange downwardly towards said bottom.
 4. The dishwasher of claim 1 wherein said housing comprises a polymeric material.
 5. The dishwasher as claimed in claim 4 wherein said housing comprises polyethylene.
 6. A dishwasher as claimed in claim 1 wherein said top is reinforced by concentrically disposed circular steps disposed at substantially the centre of said top.
 7. A dishwasher as claimed in claim 1 wherein said top sits on a ledge formed in said container shell; and further comprising cutlery holding means having a plurality of apertures formed in an inwardly disposed extension of said ledge.
 8. A dishwasher as claimed in claim 1 wherein said perpendicularly disposed tube further includes an extension thereof disposed at substantially right angles thereto, proximate said top when said top is closed onto said container shell; said extension having apertures therein to discharge water and having the end thereof which is remote from said perpendicularly disposed tube being further bent and directed generally towards said container shell bottom; said extension being closed at said remote end and having an aperture in said end in a plane substantially perpendicular to the plane of disposition of the apertures disposed in said extension.
 9. The dishwasher as claimed in claim 1 wherein the ratio of the cross-sectional area of said at least one second aperture to the cross-sectional area of said first aperture is about 3:4.
 10. The dishwasher as claimed in claim 1 wherein the ratio of the cross-sectional area of said at least one second aperture to the cross-sectional area of said first aperture is less than 3:4. 